[土壤中外源二甲基砷的转化]

[Transformation of exogenous dimethyl arsenic in soil].

作者信息

Zeng Xi-bai, Hu Liu-jie, Bai Ling-yu, Li Lian-fang, He Qiu-hong, Su Shi-ming

机构信息

Ministry of Agriculture Key Laboratory of Agro-Environment & Climate Change, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.

出版信息

Ying Yong Sheng Tai Xue Bao. 2010 Dec;21(12):3207-11.

PMID:21443010

Abstract

A pot experiment was conducted to study the speciation transformation of exogenous dimethyl arsenic (DMA) in soil. The added DMA was mainly transformed into arsenate [As(V)], accompanied with a small amount of monomethyl arsenic (MMA). When the concentration of added DMA was 30 mg x kg(-1), the transformation rate was the highest, being 6.71%, 8.11%, 11.33%, and 19.32% when the cultivation time was 10, 15, 30, and 40 days, respectively. With increasing concentration of added DMA, soil soluble arsenic (AE-As) had an increasing trend, but decreased as the cultivation time increased. Comparing with CK, the addition of DMA increased the concentrations of soil arsenic bounded to aluminum (Al-As), iron (Fe-As), calcium (Ca-As), which was possibly due to the adsorption or fixation of added DMA and its transformation products by the oxides or hydroxides of soil aluminum, iron, and calcium.

摘要

进行了一项盆栽试验以研究外源二甲基砷（DMA）在土壤中的形态转化。添加的DMA主要转化为砷酸盐[As(V)]，同时伴有少量一甲基砷（MMA）。当添加的DMA浓度为30 mg x kg(-1)时，转化率最高，培养时间分别为10、15、30和40天时，转化率分别为6.71%、8.11%、11.33%和19.32%。随着添加DMA浓度的增加，土壤可溶性砷（AE-As）呈增加趋势，但随着培养时间的增加而降低。与对照相比，添加DMA增加了土壤中与铝（Al-As）、铁（Fe-As）、钙（Ca-As）结合的砷的浓度，这可能是由于添加的DMA及其转化产物被土壤铝、铁和钙的氧化物或氢氧化物吸附或固定所致。